This article is undergoing revision as part of Project: Planets, a collaborative effort to improve BattleTechWiki's coverage of planets and systems. If you would like to participate, please visit the project page, where you can add your name to the list of volunteers.

The EC821-387D system is an uninhabited system, notable for having been the site of the last decisive naval battle between the newly-founded Clans and the fleeing remnants of the spacefarer culture that had developed as an independent culture within the systems of the Pentagon Worlds during the Exodus Civil War.[1]

In September 2821 a large combined Clan naval force led by Rafe Kardaan successfully tracked down and engaged the fleeing remnants of the independent spacefarer communities established by survivors of the civil war that led to the Second Exodus. The refugees numbered in the tens of thousands and included those who had managed to flee the initial Clan attakcs on the Circe system and those who chose to evacuate and flee the spacer-founded colony known as Fasa on the outskirts of the Pentagon Worlds. Kardaan, saKhan of Clan Cloud Cobra, was a former Star League Defense ForceAdmiral and following the successful prosecution of the campaign to secure the Babylon system was placed in charge of the campaign to capture those elements of the spacefarer communities scattered across the Pentagon Worlds who had elected to flee in the face of conquest by the Clans.[1]

Kardaan's force consisted of ships from every Clan pursued the fleeing spacefarers for months, making slow gains initially as inter-clan rivalry and the haphazard and seemingly random course taken by the spacefarers frustrated Kardaan's pursuit; as the Clan vessels began to capture larger and more substantial groups of spacefarers, the surviving groups combined into one large group for survival. This larger group was much more easily tracked by Kardaan's forces, who finally caught up with the spacefarers in the EC821-387D system. The spacefarer fleet at this time consisted of five WarShips, including a Potemkin-class cruiser transporting twenty thousand civilians and a Quixote, as well as eleven JumpShips. The brief naval battle saw two of the spacefarer WarShips destroyed and all of the JumpShips captured; the Potemkin and the Quixote class vessels managed to escape briefly by jumping away, but both ships were found again within two weeks and the Potemkin captured. The Quixote-class ship was the largest spacefarer vessel to escape the Clans, disappearing when the Potemkin was captured and never being seen again.[1]